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Description
Grandstream SIP ATA 2 Port FXS Gateway | HT-812Bridge Your Analog Devices to a Powerful VoIP Network Unlock the full potential of VoIP technology without abandoning your trusted analog devices with the Grandstream HT812. This advanced 2 port Analog Telephone Adapter (ATA) allows you to seamlessly connect analog phones and fax machines to any VoIP network, making it an ideal solution for home and office environments. Built with Grandstream's market leading SIP ATA gateway technology, the HT812
Bridge Your Analog Devices to a Powerful VoIP Network
Unlock the full potential of VoIP technology without abandoning your trusted analog devices with the Grandstream HT812. This advanced 2-port Analog Telephone Adapter (ATA) allows you to seamlessly connect analog phones and fax machines to any VoIP network, making it an ideal solution for home and office environments. Built with Grandstream's market-leading SIP ATA/gateway technology, the HT812 delivers exceptional voice quality and reliability. It features two FXS ports and an integrated Gigabit NAT router, providing powerful performance and routing capabilities up to 100MBps. Experience crystal-clear conversations thanks to support for wideband HD codecs.
Key Features:
- Connect 2 Analog Devices: Supports 2 SIP profiles across 2 FXS ports, allowing you to connect two separate analog phones or fax machines.
- High-Speed Performance: Equipped with dual 10/100/1000Mbps Gigabit ports and an integrated NAT router for outstanding network performance.
- Robust Security: Protect your calls and accounts with state-of-the-art TLS and SRTP security encryption technology.
- Advanced Telephony: Supports essential features like 3-way voice conferencing per port, call waiting, call transfer, and a wide range of caller ID formats.
- Reliable Fax-over-IP: Features support for T.38 Fax protocol for dependable faxing over your IP network.
- Effortless Provisioning: Automated provisioning options, including TR-069 and XML config files, make deployment and management simple, especially with Grandstream's UCM series of IP PBXs for Zero Configuration provisioning.
- Failover Protection: A failover SIP server automatically switches to a secondary server if the main one loses connection, ensuring continuous service.
Technical Specifications
| Interfaces | |
| Telephone Interfaces | Two (2) RJ11 FXS ports |
| Network Interfaces | Two (2) 10/100/1000Mbps RJ45 ports |
| LED Indicators | POWER, LAN, WAN, PHONE1, PHONE2 |
| Factory Reset Button | Yes |
| Voice, Fax, Modem | |
| Telephony Features | Caller ID display or block, call waiting, flash, blind or attended transfer, forward, hold, do not disturb, 3-way conference |
| Voice Codecs | G.711 with Annex I/II, G.722, G.723.1, G.729A/B, G.726, iLBC, OPUS, dynamic jitter buffer, advanced line echo cancellation |
| Fax over IP | T.38 compliant Group 3 Fax Relay up to 14.4kpbs and auto-switch to G.711 for Fax Pass-through |
| Short/Long Haul Ring Load | 3 REN, up to 1km on 24AWG line |
| Caller ID | Bellcore Type 1 & 2, ETSI, BT, NTT, and DTMF-based CID |
| Disconnect Methods | Busy Tone, Polarity Reversal/Wink, Loop Current |
| Signaling & Control | |
| Network Protocols | TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, ARP/RARP, ICMP, DNS, DHCP, NTP, TFTP, SSH, STUN, SIP (RFC3261), SIP over TCP/TLS, SRTP, TR-069 |
| QoS | Layer 2 (802.1Q VLAN, 802.1p) and Layer 3 (ToS, DiffServ, MPLS) |
| DTMF Method | In-audio, RFC2833 and/or SIP INFO |
| Provisioning and Control | HTTP, HTTPS, SSH, TFTP, TR-069, secure and automated provisioning using AES encryption |
| Security | |
| Media | SRTP |
| Control | TLS/SIPS/HTTPS |
| Management | Syslog support, SSH, remote management using web browser |
| Physical | |
| Universal Power Supply | Input: 100-240VAC, 50-60Hz; Output: 12V/0.5A |
| Dimensions | 28.5 x 130 x 90 mm (H x W x D) |
| Weight | 353.33g |
| Environmental | |
| Operational Temperature | 32º – 104ºF or 0º – 40ºC |
| Storage Temperature | 14º – 140ºF or -10º – 60ºC |
| Humidity | 10 – 90% Non-condensing |
| Compliance | FCC/CE/RCM |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 18 reviews
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Product Reviews
★★★★★ 5
Definitely an essential jacket for athletic-wear & flattering
Special Size Type: Full Zip, Size: XX-Large, Color: Black
Great quality for a great price!
I was looking for a versatile athletic jacket to run in that fits over light tops & found this on Amazon. There were only a few left so I grabbed it right away, so glad I did! It's warm enough for early fall, I live in NC so I will probably use it throughout the winter too bc it's warm here. I feel like the arm length is a bit long & the sleeves a little bit tight under LS Tops but are meant to be. This is a form-fitting jacket, it does run small. I usually have to size down from an XXL to an XL in Amazon Essentials clothing bc they run big but this jacket fits me in my regular size XXL. I tried to find this type of jacket at a few different places & already out of stock in October! If it's available, buy it! You'll love it! I hope more colors are available in the future!
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Reviewed in the United States on November 13, 2025
★★★★★ 5
Comfortable active wear
Special Size Type: Quarter Zip, Size: XX-Large, Color: Slate Grey
This a comfortable piece of active wear. It fits beautifully and I love the color.
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Reviewed in the United States on May 5, 2026
★★★★★ 4
Nice looking and soft
Special Size Type: Full Zip, Size: XX-Large, Color: Slate Grey
Soft fabric and great color (grayish purplish/bluish). Pants fit nicely, but I may have been able to size down just for how high I can pull them up and them slipping down. On the other hand, I wish the jacket was bigger. It fits probably like it’s supposed to but you can definitely see every lump on my stomach. I will wear it unzipped. The material is medium weight, very stretchy, and nice. I do think it will probably pill- it just seems like things I’ve had that do. I won’t dry it. I’m 5’4” and weigh 195.
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Reviewed in the United States on October 27, 2025
★★★★★ 5
I’d buy again
Special Size Type: Full Zip, Size: Medium, Color: Slate Grey
Good quality. I wash it every week and stitching is still good.
Nice shape fitting .
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Reviewed in the United States on April 16, 2026
★★★★★ 5
Get it
Special Size Type: Quarter Zip, Size: Medium, Color: Slate Grey, Special Size Type: Quarter Zip, Size: Medium, Color: Slate Grey
Fits great. Nice material. Medium
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Reviewed in the United States on May 15, 2026